Found the Sonex turbo cooling parts list to be incorrect for several parts. The cooling pump in/out is closer to 5/8"; the electrical terminals to the pump are incorrect in the parts list;
Purchased one foot lengths of 5/8" and 1/2" silicone tubing for turbo cooling lines. The 5/8" fits a Prius pump inlet/outlet. Transition 5/8 to 1/2" tubing with a barbed reducer, then from to a 1/2 x 3/8' barbed reducer to 3/8" which will fit to the surge tank and radiator connections.
